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Re: [csswg-drafts] [mediaqueries] In-gamut media query (#5045)

From: Chris Lilley via GitHub <sysbot+gh@w3.org>
Date: Tue, 05 May 2020 18:00:42 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-624214057-1588701641-sysbot+gh@w3.org>
@leaverou wrote:

> already allow providing a fallback in color() if the specified color is _out of gamut_

@faceless2 i
> if the original color is _invalid_ 

Aha, both reasonable interpretations of wooly prose:

> The color function takes one or more comma-separated arguments, with each argument specifying a color, and later colors acting as "fallback" if an earlier color **can’t be displayed** (for example, if the colorspace it specifies hasn’t been loaded yet).

`can't be displayed` is undefined except for an illustrative, parenthetical example.

To test a single color to be in-gamut, for additive colorspaces, you just need to check if any component is negative, or greater than 1.0 /  100%. (While using a code path that does not prematurely clip, obviously).

For non-additive colorspaces, like print, you also need to check that TAC is not exceeded.

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Received on Tuesday, 5 May 2020 18:00:43 UTC

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